Alert archive / New Jersey / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 338, NWS Philadelphia/Mount Holly

August 7, 20194 counties in Pennsylvania; New Castle County, Delaware; 5 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 7, 2019, 5:16 PM EDT for 4 counties in Pennsylvania; New Castle County, Delaware; 5 counties in New Jersey. It was in force for 59 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 7, 2019, 5:16 PM EDT (21:16 UTC)
Expired: Aug 7, 2019, 6:15 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Salem County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 66 km from the middle of the area, began a volume at 21:19 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Aug 7, 5:50 PM EDT	HAIL 0.75	Maple Shade, NJ	PEA TO PENNY SIZE HAIL LASTED FOR ABOUT TEN MINUTES.
Aug 7, 5:53 PM EDT	TSTM WND DMG	1 E Andalusia, PA	TREE DOWN IN WIRES ON STATE RD. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 7, 2:10 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.3 hours before the alert went out and 212 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1372 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 652 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

As transmitted.

069 
WUUS51 KPHI 072116
SVRPHI
DEC003-NJC005-007-015-021-033-PAC017-045-091-101-072215-
/O.NEW.KPHI.SV.W.0338.190807T2116Z-190807T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
516 PM EDT Wed Aug 7 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern New Castle County in northern Delaware...
  Northwestern Salem County in southern New Jersey...
  Northwestern Camden County in southern New Jersey...
  Southwestern Mercer County in central New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Southeastern Bucks County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 615 PM EDT.

* At 515 PM EDT, severe thunderstorms with a history of producing 
  wind damage were located along a line extending from Washington 
  Crossing to Germantown to Chester, moving northeast at 30 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Philadelphia, Trenton, Camden, Wilmington, Gloucester City, Cherry
  Hill, Bensalem, Mount Laurel, Ewing, Norristown, Chester,
  Willingboro, Deptford, West Deptford, West Norriton, East Norriton,
  Princeton, Florence, Bellmawr and Yeadon.

This includes Interstate 295 in New Jersey between mile markers 12
and 49, and between mile markers 64 and 76.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4035 7463 3988 7491 3973 7553 4000 7544
      4007 7536 4006 7539 4008 7540 4035 7511
TIME...MOT...LOC 2115Z 243DEG 27KT 4028 7487 4003 7522 3984 7538 

HAIL...0.75IN
WIND...60MPH
 
$$

Staarmann

2 follow-up statements

828 
WWUS51 KPHI 072147
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
547 PM EDT Wed Aug 7 2019

DEC003-NJC033-072157-
/O.CAN.KPHI.SV.W.0338.000000T0000Z-190807T2215Z/
New Castle DE-Salem NJ-
547 PM EDT Wed Aug 7 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE AND
NORTHWESTERN SALEM COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until 900 PM EDT for
southern, central and northwestern New Jersey...and southeastern
Pennsylvania.

LAT...LON 4035 7463 3988 7491 3976 7540 4013 7514
      4035 7489
TIME...MOT...LOC 2147Z 253DEG 24KT 4024 7481 4002 7498 3985 7520 

$$

NJC005-007-015-021-PAC017-045-091-101-072215-
/O.CON.KPHI.SV.W.0338.000000T0000Z-190807T2215Z/
Camden NJ-Mercer NJ-Gloucester NJ-Burlington NJ-Montgomery PA-
Bucks PA-Philadelphia PA-Delaware PA-
547 PM EDT Wed Aug 7 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHWESTERN CAMDEN...CENTRAL MERCER...NORTHWESTERN GLOUCESTER...
NORTHWESTERN BURLINGTON...SOUTHEASTERN MONTGOMERY...SOUTHEASTERN
BUCKS...PHILADELPHIA AND SOUTHEASTERN DELAWARE COUNTIES...

At 547 PM EDT, severe thunderstorms were located along a line
extending from Yardley to Riverside to West Deptford, moving east at
25 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Philadelphia, Trenton, Camden, Gloucester City, Cherry Hill,
Bensalem, Mount Laurel, Ewing, Willingboro, Deptford, West Deptford,
Princeton, Florence, Bellmawr, Yeadon, Woodbury, Burlington, Bristol,
Riverside and Palmyra.

This includes Interstate 295 in New Jersey between mile markers 12
and 49, and between mile markers 64 and 76.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4035 7463 3988 7491 3976 7540 4013 7514
      4035 7489
TIME...MOT...LOC 2147Z 253DEG 24KT 4024 7481 4002 7498 3985 7520 

HAIL...0.75IN
WIND...60MPH
 
$$

Staarmann

704 
WWUS51 KPHI 072207
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
607 PM EDT Wed Aug 7 2019

NJC005-007-015-021-PAC017-045-091-101-072216-
/O.EXP.KPHI.SV.W.0338.000000T0000Z-190807T2215Z/
Camden NJ-Mercer NJ-Gloucester NJ-Burlington NJ-Montgomery PA-
Bucks PA-Philadelphia PA-Delaware PA-
607 PM EDT Wed Aug 7 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CAMDEN...CENTRAL
MERCER...NORTHWESTERN GLOUCESTER...NORTHWESTERN BURLINGTON...
SOUTHEASTERN MONTGOMERY...SOUTHEASTERN BUCKS...PHILADELPHIA AND
SOUTHEASTERN DELAWARE COUNTIES WILL EXPIRE AT 615 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 900 PM EDT for
southern, central and northwestern New Jersey...and southeastern
Pennsylvania.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

Remember, a Severe Thunderstorm Warning still remains in effect for
portions of southern New Jersey until 715 PM EDT.

LAT...LON 4035 7463 3988 7491 3976 7540 4013 7514
      4035 7489
TIME...MOT...LOC 2206Z 243DEG 27KT 4030 7466 4008 7483 3991 7505 

$$

Staarmann

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 7, 10:02 AM EDT	Flash Flood Watch	PHI	Bucks, Delaware, Montgomery, Philadelphia	11 hr
Aug 7, 1:02 PM EDT	Areal Flood Advisory	PHI	Bucks	4 hr
Aug 7, 1:22 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	38 min
Aug 7, 1:26 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	49 min
Aug 7, 1:46 PM EDT	Severe Thunderstorm Warning	PHI	Berks	44 min
Aug 7, 2:01 PM EDT	Areal Flood Advisory	PHI	Bucks	97 min
Aug 7, 2:59 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	31 min
Aug 7, 3:01 PM EDT	Areal Flood Advisory	PHI	Berks	2 hr
Aug 7, 3:02 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	43 min
Aug 7, 3:18 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	42 min
Aug 7, 3:24 PM EDT	Flash Flood Warning	PHI	Berks	106 min
Aug 7, 3:24 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	51 min
Aug 7, 3:30 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery	30 min
Aug 7, 3:31 PM EDT	Special Weather Statement	PHI	Philadelphia	44 min
Aug 7, 3:41 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh, Northampton	91 min
Aug 7, 3:54 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Northampton	51 min
Aug 7, 4:03 PM EDT	Special Weather Statement	PHI	Philadelphia	42 min
Aug 7, 4:06 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Aug 7, 4:09 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	66 min
Aug 7, 4:14 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Monroe, Northampton	46 min
Aug 7, 4:20 PM EDT	Flash Flood Warning	PHI	Bucks, Montgomery, Philadelphia	4 hr
Aug 7, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	63 min
Aug 7, 4:44 PM EDT	Flash Flood Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	3 hr
Aug 7, 5:57 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	78 min
Aug 7, 6:01 PM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Philadelphia	3 hr
Aug 7, 6:10 PM EDT	River Flood Warning	PHI	Delaware	119 min
Aug 7, 7:42 PM EDT	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Aug 7, 1:46 PM EDT	Special Weather Statement	PHI	Sussex	29 min
Aug 7, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	41 min
Aug 7, 4:44 PM EDT	Special Weather Statement	PHI	New Castle	31 min
Aug 7, 4:57 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	63 min
Aug 7, 5:33 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	42 min
Aug 7, 5:53 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	52 min
Aug 7, 6:39 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	51 min
Aug 7, 7:23 PM EDT	Special Weather Statement	PHI	Sussex	37 min
Aug 7, 7:54 PM EDT	Special Weather Statement	PHI	Sussex	36 min
Aug 6, 8:05 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Warren	55 min
Aug 7, 12:55 PM EDT	Special Weather Statement	PHI	Hunterdon	35 min
Aug 7, 1:12 PM EDT	Special Weather Statement	PHI	Monmouth	33 min
Aug 7, 1:33 PM EDT	Special Marine Warning	PHI		42 min
Aug 7, 1:38 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	52 min
Aug 7, 1:40 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Somerset	50 min
Aug 7, 1:44 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	46 min
Aug 7, 1:46 PM EDT	Flash Flood Warning	PHI	Hunterdon, Morris	4 hr
Aug 7, 1:50 PM EDT	Special Marine Warning	PHI		55 min
Aug 7, 1:52 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset	55 min
Aug 7, 2:03 PM EDT	Special Marine Warning	PHI		34 min
Aug 7, 2:07 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth	38 min
Aug 7, 2:16 PM EDT	Special Weather Statement	PHI	Cape May	29 min
Aug 7, 2:18 PM EDT	Areal Flood Advisory	PHI	Morris, Somerset	3 hr
Aug 7, 2:21 PM EDT	Special Marine Warning	PHI		23 min
Aug 7, 2:23 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	19 min
Aug 7, 2:27 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	32 min
Aug 7, 2:30 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	45 min
Aug 7, 2:57 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth, Somerset	3 hr
Aug 7, 3:05 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden	40 min
Aug 7, 3:07 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	53 min
Aug 7, 3:38 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Ocean	67 min
Aug 7, 3:42 PM EDT	Special Weather Statement	PHI	Middlesex	33 min
Aug 7, 3:49 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth	3 hr
Aug 7, 3:59 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	46 min
Aug 7, 4:03 PM EDT	Flash Flood Warning	PHI	Middlesex, Monmouth	4 hr
Aug 7, 4:34 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth	41 min
Aug 7, 4:39 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Somerset	6 hr
Aug 7, 5:02 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Morris, Somerset	22 min
Aug 7, 5:03 PM EDT	Special Marine Warning	PHI		42 min
Aug 7, 5:34 PM EDT	Special Marine Warning	PHI		56 min
Aug 7, 5:39 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Cumberland, Gloucester, Salem	51 min
Aug 7, 5:41 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	49 min
Aug 7, 6:21 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	69 min
Aug 7, 6:27 PM EDT	Special Marine Warning	PHI		63 min
Aug 7, 6:56 PM EDT	Special Marine Warning	PHI		2 hr
Aug 7, 7:09 PM EDT	Special Marine Warning	PHI		2 hr
Aug 7, 7:15 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Monmouth, Ocean	75 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2019 Severe Thunderstorm Warnings in Pennsylvania, 2019 Severe Thunderstorm Warnings in Delaware, 2019 Every severe thunderstorm warning in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.